Sfun.Erfc Method

Returns the complementary error function of a double.

public static double Erfc(
double x
);

A double value specifying the complementary error function of x.

The complementary error function method, Erfc (x), is defined to be

${\rm{erfc}}\left( x \right) = {2 \over {\sqrt \pi }}\int_x^\infty {e^{ - t^2 } } dt$

The argument x must not be so large that the result underflows. Approximately, x should be less than

${\left[ -ln \left( {\sqrt {\pi}}s \right) \right]}^{1/2}$

where s = Double.Epsilon is the smallest representable positive floating-point number.

$Plot of Erfc(x)$